from rest_framework import serializers

from goods.models import SKU
from .models import User, Address
import re
from django_redis import get_redis_connection
from rest_framework_jwt.settings import api_settings


class RegisterCreateSerializer(serializers.ModelSerializer):
    token = serializers.CharField(label='登录状态token',
                                  read_only=True)  # 增加token字段

    class Meta:
        model = User
        fields = (
        'id', 'username', 'password', 'password2', 'sms_code', 'mobile', 'allow',
        'token')  # 增加token


    password2 = serializers.CharField(label='校验密码', allow_null=False,
                                      allow_blank=False, write_only=True)
    sms_code = serializers.CharField(label='短信验证码', max_length=6, min_length=6,
                                     allow_null=False, allow_blank=False,
                                     write_only=True)
    allow = serializers.CharField(label='是否同意协议', allow_null=False,
                                  allow_blank=False, write_only=True)

    def validate_mobile(self, value):
        if not re.match(r'1[345789]\d{9}', value):
            raise serializers.ValidationError('手机号格式不正确')
        return value

    def validate_allow(self, value):
        if value != 'true':
            raise serializers.ValidationError('您未同意协议')
        return value

    def validate(self, attrs):
        password = attrs['password']
        password2 = attrs['password2']
        if password != password2:
            raise serializers.ValidationError('密码不一致')

        code = attrs['sms_code']
        redis_conn = get_redis_connection('code')

        mobile = attrs['mobile']
        redis_code = redis_conn.get('sms_%s' % mobile)
        if redis_code is None:
            raise serializers.ValidationError('验证码过期')

        if redis_code.decode() != code:
            raise serializers.ValidationError('验证码不正确')
        return attrs

    def create(self, validated_data):
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']

        user = super().create(validated_data)
        user.set_password(validated_data['password'])
        user.save()

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        user.token = token

        return user

class UserDetailSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')


class EmailSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('id','email')
        extra_kwargs = {
            'email':{
            'required':True
            }
        }

class AddressViewSerializer(serializers.ModelSerializer):
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)
    mobile = serializers.RegexField(label='手机号', regex=r'^1[3-9]\d{9}$')

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def create(self, validated_data):
        # Address模型类中有user属性,将user对象添加到模型类的创建参数中
        user = self.context['request'].user
        validated_data['user'] = user
        user = super().create(validated_data)
        return user

class AddUserBrowsingHistorySerializer(serializers.Serializer):
    sku_id = serializers.IntegerField(label='商品编号', min_value=1, required=True)

    def validate_sku_id(self,value):
        try:
            SKU.objects.get(pk=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('商品不存在')

        return value

    def create(self, validated_data):

        # 获取用户信息
        user_id = self.context['request'].user.id
        # 获取商品id
        sku_id = validated_data['sku_id']
        # 连接redis
        redis_conn = get_redis_connection('history')
        # 移除已经存在的本记录
        redis_conn.lrem('history_%s' % user_id, 0, sku_id)
        # 添加新的记录
        redis_conn.lpush('history_%s' % user_id, sku_id)
        # 保存最多5条记录
        redis_conn.ltrim('history_%s' % user_id, 0, 4)
        return validated_data

class SKUSerializer(serializers.ModelSerializer):

    class Meta:
        model = SKU
        fields = ('id', 'name', 'price', 'default_image_url', 'comments')



